tcp_var.h revision 1.98
1 /* $NetBSD: tcp_var.h,v 1.98 2003/06/23 11:02:16 martin Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 34 * 35 * NRL grants permission for redistribution and use in source and binary 36 * forms, with or without modification, of the software and documentation 37 * created at NRL provided that the following conditions are met: 38 * 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgements: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * This product includes software developed at the Information 49 * Technology Division, US Naval Research Laboratory. 50 * 4. Neither the name of the NRL nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS 55 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 56 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 57 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR 58 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 59 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 60 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 61 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 62 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 63 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 64 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 65 * 66 * The views and conclusions contained in the software and documentation 67 * are those of the authors and should not be interpreted as representing 68 * official policies, either expressed or implied, of the US Naval 69 * Research Laboratory (NRL). 70 */ 71 72 /*- 73 * Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc. 74 * All rights reserved. 75 * 76 * This code is derived from software contributed to The NetBSD Foundation 77 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 78 * NASA Ames Research Center. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the above copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * This product includes software developed by the NetBSD 91 * Foundation, Inc. and its contributors. 92 * 4. Neither the name of The NetBSD Foundation nor the names of its 93 * contributors may be used to endorse or promote products derived 94 * from this software without specific prior written permission. 95 * 96 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 97 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 98 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 99 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 100 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 101 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 102 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 103 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 104 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 105 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 106 * POSSIBILITY OF SUCH DAMAGE. 107 */ 108 109 /* 110 * Copyright (c) 1982, 1986, 1993, 1994, 1995 111 * The Regents of the University of California. All rights reserved. 112 * 113 * Redistribution and use in source and binary forms, with or without 114 * modification, are permitted provided that the following conditions 115 * are met: 116 * 1. Redistributions of source code must retain the above copyright 117 * notice, this list of conditions and the following disclaimer. 118 * 2. Redistributions in binary form must reproduce the above copyright 119 * notice, this list of conditions and the following disclaimer in the 120 * documentation and/or other materials provided with the distribution. 121 * 3. All advertising materials mentioning features or use of this software 122 * must display the following acknowledgement: 123 * This product includes software developed by the University of 124 * California, Berkeley and its contributors. 125 * 4. Neither the name of the University nor the names of its contributors 126 * may be used to endorse or promote products derived from this software 127 * without specific prior written permission. 128 * 129 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 130 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 131 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 132 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 133 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 134 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 135 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 136 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 137 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 138 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 139 * SUCH DAMAGE. 140 * 141 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 142 */ 143 144 #ifndef _NETINET_TCP_VAR_H_ 145 #define _NETINET_TCP_VAR_H_ 146 147 #if defined(_KERNEL_OPT) 148 #include "opt_inet.h" 149 #include "opt_mbuftrace.h" 150 #endif 151 152 /* 153 * Kernel variables for tcp. 154 */ 155 156 #include <sys/callout.h> 157 158 /* 159 * Tcp control block, one per tcp; fields: 160 */ 161 struct tcpcb { 162 int t_family; /* address family on the wire */ 163 struct ipqehead segq; /* sequencing queue */ 164 struct callout t_timer[TCPT_NTIMERS];/* tcp timers */ 165 short t_state; /* state of this connection */ 166 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 167 uint32_t t_rxtcur; /* current retransmit value */ 168 short t_dupacks; /* consecutive dup acks recd */ 169 u_short t_peermss; /* peer's maximum segment size */ 170 u_short t_ourmss; /* our's maximum segment size */ 171 u_short t_segsz; /* current segment size in use */ 172 char t_force; /* 1 if forcing out a byte */ 173 u_int t_flags; 174 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 175 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 176 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 177 #define TF_NOOPT 0x0008 /* don't use tcp options */ 178 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 179 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 180 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 181 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 182 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 183 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 184 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 185 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 186 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 187 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ 188 189 190 struct mbuf *t_template; /* skeletal packet for transmit */ 191 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 192 struct in6pcb *t_in6pcb; /* back pointer to internet pcb */ 193 struct callout t_delack_ch; /* delayed ACK callout */ 194 /* 195 * The following fields are used as in the protocol specification. 196 * See RFC783, Dec. 1981, page 21. 197 */ 198 /* send sequence variables */ 199 tcp_seq snd_una; /* send unacknowledged */ 200 tcp_seq snd_nxt; /* send next */ 201 tcp_seq snd_up; /* send urgent pointer */ 202 tcp_seq snd_wl1; /* window update seg seq number */ 203 tcp_seq snd_wl2; /* window update seg ack number */ 204 tcp_seq iss; /* initial send sequence number */ 205 u_long snd_wnd; /* send window */ 206 tcp_seq snd_recover; /* for use in fast recovery */ 207 /* receive sequence variables */ 208 u_long rcv_wnd; /* receive window */ 209 tcp_seq rcv_nxt; /* receive next */ 210 tcp_seq rcv_up; /* receive urgent pointer */ 211 tcp_seq irs; /* initial receive sequence number */ 212 /* 213 * Additional variables for this implementation. 214 */ 215 /* receive variables */ 216 tcp_seq rcv_adv; /* advertised window */ 217 /* retransmit variables */ 218 tcp_seq snd_max; /* highest sequence number sent; 219 * used to recognize retransmits 220 */ 221 /* congestion control (for slow start, source quench, retransmit after loss) */ 222 u_long snd_cwnd; /* congestion-controlled window */ 223 u_long snd_ssthresh; /* snd_cwnd size threshhold for 224 * for slow start exponential to 225 * linear switch 226 */ 227 /* 228 * transmit timing stuff. See below for scale of srtt and rttvar. 229 * "Variance" is actually smoothed difference. 230 */ 231 uint32_t t_rcvtime; /* time last segment received */ 232 uint32_t t_rtttime; /* time we started measuring rtt */ 233 tcp_seq t_rtseq; /* sequence number being timed */ 234 int32_t t_srtt; /* smoothed round-trip time */ 235 int32_t t_rttvar; /* variance in round-trip time */ 236 uint32_t t_rttmin; /* minimum rtt allowed */ 237 u_long max_sndwnd; /* largest window peer has offered */ 238 239 /* out-of-band data */ 240 char t_oobflags; /* have some */ 241 char t_iobc; /* input character */ 242 #define TCPOOB_HAVEDATA 0x01 243 #define TCPOOB_HADDATA 0x02 244 short t_softerror; /* possible error not yet reported */ 245 246 /* RFC 1323 variables */ 247 u_char snd_scale; /* window scaling for send window */ 248 u_char rcv_scale; /* window scaling for recv window */ 249 u_char request_r_scale; /* pending window scaling */ 250 u_char requested_s_scale; 251 u_int32_t ts_recent; /* timestamp echo data */ 252 u_int32_t ts_recent_age; /* when last updated */ 253 u_int32_t ts_timebase; /* our timebase */ 254 tcp_seq last_ack_sent; 255 256 /* SACK stuff */ 257 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 258 259 /* path MTU discovery blackhole detection */ 260 int t_mtudisc; /* perform mtudisc for this tcb */ 261 262 /* pointer for syn cache entries*/ 263 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 264 }; 265 266 #ifdef _KERNEL 267 /* 268 * TCP reassembly queue locks. 269 */ 270 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 271 __attribute__((__unused__)); 272 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 273 __attribute__((__unused__)); 274 275 static __inline int 276 tcp_reass_lock_try(tp) 277 struct tcpcb *tp; 278 { 279 int s; 280 281 /* 282 * Use splvm() -- we're blocking things that would cause 283 * mbuf allocation. 284 */ 285 s = splvm(); 286 if (tp->t_flags & TF_REASSEMBLING) { 287 splx(s); 288 return (0); 289 } 290 tp->t_flags |= TF_REASSEMBLING; 291 splx(s); 292 return (1); 293 } 294 295 static __inline void 296 tcp_reass_unlock(tp) 297 struct tcpcb *tp; 298 { 299 int s; 300 301 s = splvm(); 302 tp->t_flags &= ~TF_REASSEMBLING; 303 splx(s); 304 } 305 306 #ifdef DIAGNOSTIC 307 #define TCP_REASS_LOCK(tp) \ 308 do { \ 309 if (tcp_reass_lock_try(tp) == 0) { \ 310 printf("%s:%d: tcpcb %p reass already locked\n", \ 311 __FILE__, __LINE__, tp); \ 312 panic("tcp_reass_lock"); \ 313 } \ 314 } while (/*CONSTCOND*/ 0) 315 #define TCP_REASS_LOCK_CHECK(tp) \ 316 do { \ 317 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 318 printf("%s:%d: tcpcb %p reass lock not held\n", \ 319 __FILE__, __LINE__, tp); \ 320 panic("tcp reass lock check"); \ 321 } \ 322 } while (/*CONSTCOND*/ 0) 323 #else 324 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 325 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 326 #endif 327 328 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 329 #endif /* _KERNEL */ 330 331 /* 332 * Queue for delayed ACK processing. 333 */ 334 #ifdef _KERNEL 335 extern int tcp_delack_ticks; 336 void tcp_delack(void *); 337 338 #define TCP_RESTART_DELACK(tp) \ 339 callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \ 340 tcp_delack, tp) 341 342 #define TCP_SET_DELACK(tp) \ 343 do { \ 344 if (((tp)->t_flags & TF_DELACK) == 0) { \ 345 (tp)->t_flags |= TF_DELACK; \ 346 TCP_RESTART_DELACK(tp); \ 347 } \ 348 } while (/*CONSTCOND*/0) 349 350 #define TCP_CLEAR_DELACK(tp) \ 351 do { \ 352 if ((tp)->t_flags & TF_DELACK) { \ 353 (tp)->t_flags &= ~TF_DELACK; \ 354 callout_stop(&(tp)->t_delack_ch); \ 355 } \ 356 } while (/*CONSTCOND*/0) 357 #endif /* _KERNEL */ 358 359 /* 360 * Compute the current timestamp for a connection. 361 */ 362 #define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase) 363 364 /* 365 * Handy way of passing around TCP option info. 366 */ 367 struct tcp_opt_info { 368 int ts_present; 369 u_int32_t ts_val; 370 u_int32_t ts_ecr; 371 u_int16_t maxseg; 372 }; 373 374 /* 375 * Data for the TCP compressed state engine. 376 */ 377 union syn_cache_sa { 378 struct sockaddr sa; 379 struct sockaddr_in sin; 380 #if 1 /*def INET6*/ 381 struct sockaddr_in6 sin6; 382 #endif 383 }; 384 385 struct syn_cache { 386 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 387 struct callout sc_timer; /* rexmt timer */ 388 union { /* cached route */ 389 struct route route4; 390 #ifdef INET6 391 struct route_in6 route6; 392 #endif 393 } sc_route_u; 394 #define sc_route4 sc_route_u.route4 395 #ifdef INET6 396 #define sc_route6 sc_route_u.route6 397 #endif 398 long sc_win; /* advertised window */ 399 int sc_bucketidx; /* our bucket index */ 400 u_int32_t sc_hash; 401 u_int32_t sc_timestamp; /* timestamp from SYN */ 402 u_int32_t sc_timebase; /* our local timebase */ 403 union syn_cache_sa sc_src; 404 union syn_cache_sa sc_dst; 405 tcp_seq sc_irs; 406 tcp_seq sc_iss; 407 u_int sc_rxtcur; /* current rxt timeout */ 408 u_int sc_rxttot; /* total time spend on queues */ 409 u_short sc_rxtshift; /* for computing backoff */ 410 u_short sc_flags; 411 412 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 413 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 414 415 struct mbuf *sc_ipopts; /* IP options */ 416 u_int16_t sc_peermaxseg; 417 u_int16_t sc_ourmaxseg; 418 u_int8_t sc_request_r_scale : 4, 419 sc_requested_s_scale : 4; 420 421 struct tcpcb *sc_tp; /* tcb for listening socket */ 422 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 423 }; 424 425 struct syn_cache_head { 426 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 427 u_short sch_length; /* # entries in bucket */ 428 }; 429 430 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 431 #ifdef INET6 432 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) 433 #endif 434 #ifndef INET6 435 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 436 #else 437 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ 438 ? intotcpcb(sotoinpcb(so)) \ 439 : in6totcpcb(sotoin6pcb(so))) 440 #endif 441 442 /* 443 * The smoothed round-trip time and estimated variance 444 * are stored as fixed point numbers scaled by the values below. 445 * For convenience, these scales are also used in smoothing the average 446 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 447 * With these scales, srtt has 3 bits to the right of the binary point, 448 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 449 * binary point, and is smoothed with an ALPHA of 0.75. 450 */ 451 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 452 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 453 454 /* 455 * The initial retransmission should happen at rtt + 4 * rttvar. 456 * Because of the way we do the smoothing, srtt and rttvar 457 * will each average +1/2 tick of bias. When we compute 458 * the retransmit timer, we want 1/2 tick of rounding and 459 * 1 extra tick because of +-1/2 tick uncertainty in the 460 * firing of the timer. The bias will give us exactly the 461 * 1.5 tick we need. But, because the bias is 462 * statistical, we have to test that we don't drop below 463 * the minimum feasible timer (which is 2 ticks). 464 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 465 * is the same as the multiplier for rttvar. 466 */ 467 #define TCP_REXMTVAL(tp) \ 468 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 469 470 /* 471 * Compute the initial window for slow start. 472 */ 473 #define TCP_INITIAL_WINDOW(iw, segsz) \ 474 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 475 ((segsz) * (iw))) 476 477 /* 478 * TCP statistics. 479 * Many of these should be kept per connection, 480 * but that's inconvenient at the moment. 481 */ 482 struct tcpstat { 483 u_quad_t tcps_connattempt; /* connections initiated */ 484 u_quad_t tcps_accepts; /* connections accepted */ 485 u_quad_t tcps_connects; /* connections established */ 486 u_quad_t tcps_drops; /* connections dropped */ 487 u_quad_t tcps_conndrops; /* embryonic connections dropped */ 488 u_quad_t tcps_closed; /* conn. closed (includes drops) */ 489 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ 490 u_quad_t tcps_rttupdated; /* times we succeeded */ 491 u_quad_t tcps_delack; /* delayed acks sent */ 492 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 493 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ 494 u_quad_t tcps_persisttimeo; /* persist timeouts */ 495 u_quad_t tcps_keeptimeo; /* keepalive timeouts */ 496 u_quad_t tcps_keepprobe; /* keepalive probes sent */ 497 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ 498 u_quad_t tcps_persistdrops; /* connections dropped in persist */ 499 u_quad_t tcps_connsdrained; /* connections drained due to memory 500 shortage */ 501 u_quad_t tcps_pmtublackhole; /* PMTUD blackhole detected */ 502 503 u_quad_t tcps_sndtotal; /* total packets sent */ 504 u_quad_t tcps_sndpack; /* data packets sent */ 505 u_quad_t tcps_sndbyte; /* data bytes sent */ 506 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ 507 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 508 u_quad_t tcps_sndacks; /* ack-only packets sent */ 509 u_quad_t tcps_sndprobe; /* window probes sent */ 510 u_quad_t tcps_sndurg; /* packets sent with URG only */ 511 u_quad_t tcps_sndwinup; /* window update-only packets sent */ 512 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 513 514 u_quad_t tcps_rcvtotal; /* total packets received */ 515 u_quad_t tcps_rcvpack; /* packets received in sequence */ 516 u_quad_t tcps_rcvbyte; /* bytes received in sequence */ 517 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ 518 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ 519 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 520 u_quad_t tcps_rcvshort; /* packets received too short */ 521 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ 522 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 523 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ 524 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 525 u_quad_t tcps_rcvoopack; /* out-of-order packets received */ 526 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ 527 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ 528 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 529 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ 530 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ 531 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ 532 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 533 u_quad_t tcps_rcvackpack; /* rcvd ack packets */ 534 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 535 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ 536 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ 537 u_quad_t tcps_predack; /* times hdr predict ok for acks */ 538 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ 539 540 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 541 u_quad_t tcps_noport; /* no socket on port */ 542 u_quad_t tcps_badsyn; /* received ack for which we have 543 no SYN in compressed state */ 544 545 /* These statistics deal with the SYN cache. */ 546 u_quad_t tcps_sc_added; /* # of entries added */ 547 u_quad_t tcps_sc_completed; /* # of connections completed */ 548 u_quad_t tcps_sc_timed_out; /* # of entries timed out */ 549 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ 550 u_quad_t tcps_sc_reset; /* # dropped due to RST */ 551 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 552 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 553 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 554 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 555 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 556 u_quad_t tcps_sc_collisions; /* # of hash collisions */ 557 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ 558 559 u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */ 560 }; 561 562 /* 563 * Names for TCP sysctl objects. 564 */ 565 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 566 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 567 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 568 #define TCPCTL_MSSDFLT 4 /* default seg size */ 569 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 570 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 571 #if 0 /*obsoleted*/ 572 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 573 #endif 574 #define TCPCTL_INIT_WIN 8 /* initial window */ 575 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 576 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 577 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 578 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 579 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 580 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 581 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 582 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 583 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 584 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 585 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 586 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 587 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 588 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ 589 #if 0 /*obsoleted*/ 590 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ 591 #endif 592 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ 593 #define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */ 594 #define TCPCTL_INIT_WIN_LOCAL 26 /* initial window for local nets */ 595 #define TCPCTL_IDENT 27 /* rfc 931 identd */ 596 #define TCPCTL_MAXID 28 597 598 #define TCPCTL_NAMES { \ 599 { 0, 0 }, \ 600 { "rfc1323", CTLTYPE_INT }, \ 601 { "sendspace", CTLTYPE_INT }, \ 602 { "recvspace", CTLTYPE_INT }, \ 603 { "mssdflt", CTLTYPE_INT }, \ 604 { "syn_cache_limit", CTLTYPE_INT }, \ 605 { "syn_bucket_limit", CTLTYPE_INT }, \ 606 { 0, 0 },\ 607 { "init_win", CTLTYPE_INT }, \ 608 { "mss_ifmtu", CTLTYPE_INT }, \ 609 { "sack", CTLTYPE_INT }, \ 610 { "win_scale", CTLTYPE_INT }, \ 611 { "timestamps", CTLTYPE_INT }, \ 612 { "compat_42", CTLTYPE_INT }, \ 613 { "cwm", CTLTYPE_INT }, \ 614 { "cwm_burstsize", CTLTYPE_INT }, \ 615 { "ack_on_push", CTLTYPE_INT }, \ 616 { "keepidle", CTLTYPE_INT }, \ 617 { "keepintvl", CTLTYPE_INT }, \ 618 { "keepcnt", CTLTYPE_INT }, \ 619 { "slowhz", CTLTYPE_INT }, \ 620 { "newreno", CTLTYPE_INT }, \ 621 { "log_refused",CTLTYPE_INT }, \ 622 { 0, 0 }, \ 623 { "rstppslimit", CTLTYPE_INT }, \ 624 { "delack_ticks", CTLTYPE_INT }, \ 625 { "init_win_local", CTLTYPE_INT }, \ 626 { "ident", CTLTYPE_STRUCT }, \ 627 } 628 629 struct sysctl_tcp_ident_args { 630 struct in_addr raddr; 631 u_int rport; 632 struct in_addr laddr; 633 u_int lport; 634 }; 635 636 #ifdef _KERNEL 637 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 638 #ifdef INET6 639 extern struct in6pcb tcb6; 640 #endif 641 extern struct tcpstat tcpstat; /* tcp statistics */ 642 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ 643 extern int tcp_do_rfc1323; /* enabled/disabled? */ 644 extern int tcp_do_sack; /* SACK enabled/disabled? */ 645 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 646 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 647 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 648 extern int tcp_mssdflt; /* default seg size */ 649 extern int tcp_init_win; /* initial window */ 650 extern int tcp_init_win_local; /* initial window for local nets */ 651 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 652 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 653 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 654 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 655 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 656 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 657 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 658 extern int tcp_log_refused; /* log refused connections */ 659 660 extern int tcp_rst_ppslim; 661 662 extern int tcp_syn_cache_size; 663 extern struct syn_cache_head tcp_syn_cache[]; 664 extern u_long syn_cache_count; 665 666 #ifdef MBUFTRACE 667 extern struct mowner tcp_rx_mowner; 668 extern struct mowner tcp_tx_mowner; 669 extern struct mowner tcp_mowner; 670 #endif 671 672 #define TCPCTL_VARIABLES { \ 673 { 0 }, \ 674 { 1, 0, &tcp_do_rfc1323 }, \ 675 { 1, 0, &tcp_sendspace }, \ 676 { 1, 0, &tcp_recvspace }, \ 677 { 1, 0, &tcp_mssdflt }, \ 678 { 1, 0, &tcp_syn_cache_limit }, \ 679 { 1, 0, &tcp_syn_bucket_limit }, \ 680 { 0 }, \ 681 { 1, 0, &tcp_init_win }, \ 682 { 1, 0, &tcp_mss_ifmtu }, \ 683 { 1, 0, &tcp_do_sack }, \ 684 { 1, 0, &tcp_do_win_scale }, \ 685 { 1, 0, &tcp_do_timestamps }, \ 686 { 1, 0, &tcp_compat_42 }, \ 687 { 1, 0, &tcp_cwm }, \ 688 { 1, 0, &tcp_cwm_burstsize }, \ 689 { 1, 0, &tcp_ack_on_push }, \ 690 { 1, 0, &tcp_keepidle }, \ 691 { 1, 0, &tcp_keepintvl }, \ 692 { 1, 0, &tcp_keepcnt }, \ 693 { 1, 1, 0, PR_SLOWHZ }, \ 694 { 1, 0, &tcp_do_newreno }, \ 695 { 1, 0, &tcp_log_refused }, \ 696 { 0 }, \ 697 { 1, 0, &tcp_rst_ppslim }, \ 698 { 1, 0, &tcp_delack_ticks }, \ 699 { 1, 0, &tcp_init_win_local }, \ 700 } 701 702 #ifdef __NO_STRICT_ALIGNMENT 703 #define TCP_HDR_ALIGNED_P(th) 1 704 #else 705 #define TCP_HDR_ALIGNED_P(th) ((((vaddr_t) (th)) & 3) == 0) 706 #endif 707 708 int tcp_attach __P((struct socket *)); 709 void tcp_canceltimers __P((struct tcpcb *)); 710 struct tcpcb * 711 tcp_close __P((struct tcpcb *)); 712 #ifdef INET6 713 void tcp6_ctlinput __P((int, struct sockaddr *, void *)); 714 #endif 715 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 716 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 717 struct tcpcb * 718 tcp_disconnect __P((struct tcpcb *)); 719 struct tcpcb * 720 tcp_drop __P((struct tcpcb *, int)); 721 void tcp_dooptions __P((struct tcpcb *, 722 u_char *, int, struct tcphdr *, struct tcp_opt_info *)); 723 void tcp_drain __P((void)); 724 #ifdef INET6 725 void tcp6_drain __P((void)); 726 #endif 727 void tcp_established __P((struct tcpcb *)); 728 void tcp_init __P((void)); 729 #ifdef INET6 730 int tcp6_input __P((struct mbuf **, int *, int)); 731 #endif 732 void tcp_input __P((struct mbuf *, ...)); 733 u_long tcp_mss_to_advertise __P((const struct ifnet *, int)); 734 void tcp_mss_from_peer __P((struct tcpcb *, int)); 735 struct tcpcb * 736 tcp_newtcpcb __P((int, void *)); 737 void tcp_notify __P((struct inpcb *, int)); 738 #ifdef INET6 739 void tcp6_notify __P((struct in6pcb *, int)); 740 #endif 741 u_int tcp_optlen __P((struct tcpcb *)); 742 int tcp_output __P((struct tcpcb *)); 743 void tcp_pulloutofband __P((struct socket *, 744 struct tcphdr *, struct mbuf *, int)); 745 void tcp_quench __P((struct inpcb *, int)); 746 #ifdef INET6 747 void tcp6_quench __P((struct in6pcb *, int)); 748 #endif 749 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *)); 750 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *, 751 struct tcphdr *, tcp_seq, tcp_seq, int)); 752 void tcp_rmx_rtt __P((struct tcpcb *)); 753 void tcp_setpersist __P((struct tcpcb *)); 754 void tcp_slowtimo __P((void)); 755 struct mbuf * 756 tcp_template __P((struct tcpcb *)); 757 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int)); 758 struct tcpcb * 759 tcp_usrclosed __P((struct tcpcb *)); 760 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 761 int tcp_usrreq __P((struct socket *, 762 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 763 void tcp_xmit_timer __P((struct tcpcb *, uint32_t)); 764 tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq)); 765 tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t, 766 tcp_seq)); 767 768 int syn_cache_add __P((struct sockaddr *, struct sockaddr *, 769 struct tcphdr *, unsigned int, struct socket *, 770 struct mbuf *, u_char *, int, struct tcp_opt_info *)); 771 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *, 772 struct tcphdr *)); 773 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *, 774 struct tcphdr *, unsigned int, unsigned int, 775 struct socket *so, struct mbuf *)); 776 void syn_cache_init __P((void)); 777 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *)); 778 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *, 779 struct syn_cache_head **)); 780 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *, 781 struct tcphdr *)); 782 int syn_cache_respond __P((struct syn_cache *, struct mbuf *)); 783 void syn_cache_timer __P((void *)); 784 void syn_cache_cleanup __P((struct tcpcb *)); 785 786 int tcp_newreno __P((struct tcpcb *, struct tcphdr *)); 787 #endif 788 789 #endif /* _NETINET_TCP_VAR_H_ */ 790
Indexes created Sat Sep 27 14:09:57 GMT 2025